The coordinated global network of collaborating centres (CCs) is at the
core of the GEO process. These centres have played an increasingly active
role in preparing GEO reports. Regional centres are now responsible for
almost all the regional inputs, combining top-down integrated assessment
with bottom-up environmental reporting. Other institutions provide specialized
expertise on cross-cutting or thematic issues.
Working groups provide advice and support to the GEO process, particularly
on integrated assessment methodologies and process planning.
Other United Nations agencies contribute to the GEO process, mainly by
providing substantive data and information on the many environmental and
related issues that fall under their individual mandates. They also participate
in the review process.